A Hebbian synapse emulation circuit models the conductance of a synapse circuit. The computing system includes a motherboard with a memory module connector and a riser card inserted into the first memory module connector. The means to repel may prevent the coating of a target surface of the workpiece. The slanted contact surface extends on the front side of the hook shank from the outer side to the inner side and extends along the forward edge of the hook shank over the entire length of the hook shank. According to the invention, an arrangement comprising a plurality of capacitors is provided in order to power a flash lamp and the connection of said capacitors within the arrangement is controlled in a programmed manner such that the resulting capacitance thereof increases from one flash in the next.